I think Raph would definitely stay up late at night listening to Donnie talk/fanboy about tech/science stuff he's been working on lately even though Raph most likely wouldn't understand a lot of it but likes listening anyways because he likes seeing his brothers happy and then would accidentally pass out and Donnie wouldn't notice for a while until he hears snoring and I think since donnie is to tired to carry him,Don would grab a blanket and throw it over him and continue with whatever project he's been working on in a peaceful silence with a smile.
I feel like this would happen often :)
Edit: I'm definitely gonna draw this soon I'll make sure to post it here when I do!
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my rottmnt headcanons!
Randomjust some lil turtle bros headcanons of mine :) I will add more eventually!!!